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5 Continuous and Discrete Models If a variable is a continuous variable, it has a value at any given instant of time. If a variable is a discrete variable, it has only values at discrete instances in time, for example, every second or minute. It is also possible that a variable has discrete values with respect to a spatial coordinate , however, this type ofbehavior will not be considered here. Discrete time models describe the state ofthe system at given time intervals. When using computers for calculation of the model output, continuous models need to be discretized.
5. You might like to save your simulation in your own directory. g. appc, to the MATLAB path. In the MATLAB Command Window, select File, Set Path. The Path Browser menu appears. Select Path, Add to Path, and type the name of the path you would like to add, for example C:\MATLABRxx\toolbox\appc. It is also possible to create your own graphs rather than using the scope. In that case you have to store the multiplexer data to file. In the Simulink Library Browser window, select Sinks, To File and drag the File option to the model window.
In addition, the control actions that are calculated in regulating a plant are often based on a model of the process. The same model can also be used to study the effects of a plant upset. 2 Types of Models The different applications of models and the different modeling goals have lead to many different model structures. This is shown in Fig. 1 [van Lith, 2002] . 1 White Box and Black Box Models Models that are based on physical and chemical laws ofconservation are called white box, first p rinciples or mechanistic models .